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Reliable TCP transfer uses acknowledgements from the receiver to the sender that it did indeed receive the data correctly. If sender has not received acknowledgement for the first packet it sent, it will stop and wait and if this wait exceeds a certain limit, it may even retransmit.
An RWIN that is too large will result in greater loss of data if a packet is lost or damaged. An RWIN that is too small will be very slow as more acknowledgements are required for the same amount of data.
To find your optimum RWIN please reference this Tweak FAQ.
Andy Houtz DSL